Our Hair Growth Calculator is here to give you an answer to all of your questions. Do you want to know how long or short your hair will be in a week, a few months, or years? Additionally, are you interested in learning about hair, its stages, and how you can improve it? Don’t worry, because we will answer all those questions and clear up the doubts for you using our handy and newbie-friendly calculator. 

You like our calculators, so you want to explore more useful tools? Are you struggling with glucose problems? Check out our comprehensive medical Estimated Average Glucose Calculator. For the list of the healthiest food that you should never skip in your meals, head over to our Glycemic Index Calculator. However, if you are looking for finance-related calculators, check out finance category that contains a full list of all finance calculators.

Hair Growth Rate

Naturally, hair grows between 0.5 and 1.7 cm per month, or 15 cm a year. But, you should consider that many factors affect its rate. For example, statistics shows that males have a higher hair growth rate than females. But, you need to understand that it wholly depends.

How fast or slow does your hair grow?

It is claimed that Africans have the lowest hair growth rate, whereas Asian hair grows fastest. However, besides race, the rate significantly depends on genetics, age, and health.

In summer, when people start changing their diets, eating more fruits and vegetables, and due to the hormonal changes, hair normally grows faster.

In conclusion, how long your hairs grows is an individual thing. Therefore, we can only figure out how fast an individual’s hair will grow roughly, not with certainty.

Stages of Hair Growth

Stages of Hair Growth

Have you ever wondered how hair grows and through what stages it goes?

Believe it or not, but hair growth cycle is more complex than you would ever imagine. Generally, so many studies are fully dedicated to its stages, and they analyze it in detail. Therefore, hair goes through four different stages before it grows completely and gets visible to our human eye.

So, what are those stages? Let’s cover them below, respectively:

  1. Anagen – a growing and the longest phase in the cycle. Generally, it lasts for about 3 to 5 years, but there are some exceptions, and for some people, it can take more than 7 years until it completes. However, the duration of this phase greatly depends on the type of hair. For example, hair on eyebrows lasts way shorter than on your head.
  2. Catagen or transition phase – starts when the anagen phases end and last for about 10 days. In the catagen phase, your hair starts growing slower, and the hair separates from the bottom part of hair follicles.
  3. Telogen or resting phase – naturally lasts roughly 3 months. Importantly, in this phase, neither your hair grows nor falls out. Instead, new hair starts forming into follicles in this period, and the old hair sheds.
  4. Exogen or shedding phase – generally represents the extension of the telogen phase. In the exogen phase, hair continues shedding (e.g. in pregnancy). It can last for 2 to 5 months, and you can lose 50 to 100 hairs every day. But don’t freak out because it’s normal.

How to Improve Hair Growth?

Generally, you cannot control everything that affects your hair growth. Because there are some birth-given factors that either you cannot monitor or improve, such as genes, race, age, gender, etc. However, it doesn’t mean that you have no control over your hair growth. Indeed, there are some tips and recommendations that you should take and implement those things into your life to enhance and fasten the process. 

Check out those tips that improve and make your hair grow faster:

  • Do not choose too “restrictive” diets because it makes you avoid essential nutrients for hair growth.
  • Choose protein-rich food, at least 50g of proteins a day.
  • Include vitamins C, D, E, iron, and zinc in your meals.
  • Straighteners or hair dryers can greatly damage your hair. Thus, be careful with their usage and the temperature you set.
  • Coconut oil or aloe vera are two highly recommended hair enhancers.

How Often Should You Trim Your Hair?

We need to clear up some common misconceptions about haircuts to answer this question.

How Often Should You Trim Your Hair?

Important: Some people believe that the less frequently you trim (cut) your hair, the faster it grows. On the contrary, some people believe that you have to trim your hair every week or two to make it grow faster. However, both of these claims are wrong!

Statistics claim that delaying the haircut can cause more damage to your hair than trimming it regularly.

Giving you a good and clear perspective on how often you should trim your hair depends on the hair type. In other words, you shouldn’t have the same haircut frequency for short, long, medium-size hair, thick or thin hair, coarse or fine hair, etc.

For example, if you have short hair, it is recommended to trim it every month. Additionally, for medium-sized hair, every 6-8 weeks, those with long hair should cut it every 3-6 months.

Best Ingredients for Hair Growth

Here is the table that shows you the best food or ingredients for hair growth:

Fatty fish
Sweet potatoes
Sweet pepper
Meat (especially red meat)
Aloe vera
Onion juice
Ingredients that make your hair grow faster

Hair Growth Formula

In general, the average hair length that an individual gets is 1.27 cm or 0.5 inches per month. Therefore using this data, we can derive the following formula:

L = 0.5 \times t

L – the total hair length in centimeters, inches, or millimeters.
t – period for which you want to calculate it (date)

Hair Growth Calculator – How to Use?

Using this formula, you can manually calculate how much your hair will grow in a particular period. However, why would you bother with it? Instead, we recommend using our Hair Growth Calculator, a beginner-friendly and one-click tool.


  1. Select the growth time (for a needed date)
  2. The calculator applies the formula and returns the hair growth length in inches, centimeters, or millimeters, depending on what unit you choose.

Hair Growth Calculator – Example

Let’s utilize our Hair Growth Calculator and show its use in a real example below.

Scenario: You decided to grow hair, and you want to know how much approximately it can grow in two years. Let’s find it out in our calculator.


  • First, open our calculator and choose the growth time to be “2 years”.
  • Select the length unit (inches, cm, or mm) and check the growth length displayed by our Hair Growth Calculator – 30.48 cm or 12 inches.


How do I calculate my hair growth rate?

You can measure it for a particular period using a simple formula:  L = 0.5 \times t
Multiply the time (days, weeks, years) by the number 0.5. Why would you use this number? It’s not a magical number, but we use it because the studies showed that, on average, hair grows around 0.5 inches per year.

Can hair grow 2 inches in a month?

Normally, hair can only grow roughly 0.5 inches in a month. However, the length depends on many factors: your genes, race, diet, etc.

What is the secret of hair growth?

Obviously, you can’t control the whole process, but certainly, you can some of the phases. Therefore, if you know the secret behind it, you can improve it greatly. So, if you want to optimize it to the maximum, you should:
– Avoid “too restrictive” diet.
– Consume a lot of protein-rich food, vitamins C, D, E.
– Avoid using straighteners, hairdryers, and more.

What causes slow hair growth?

These are some of the most common causes of slower hair growth:
– Lack of vitamins
– Stress and illness
– Chemotherapy
– Hormonal imbalance
– Dryers, straighteners, curling irons
– Genetics
– Improper diet

What hormone causes the growth of the hair?

Androgen hormones play a big role in your hair growth or loss. For example, if your androgen hormone is too high, your hair will start growing fast. On the contrary, you will start losing your hair if it is low.

How long can your hair be in 6 months?

We can estimate that you can grow your hair for about 3 inches or 7.62 centimeters in 6 months. Check it with our Hair Growth Calculator.